A record 512bn of work hours were lost around the world in 2023 because of the risk of heat exposure, says a new report from the Lancet Countdown on Health and Climate Change.
Agricultural workers in low-income countries were disproportionately affected, the authors say, costing countries around 8% of their GDP in 2023.
The findings are part of the ninth iteration of the annual report, which features indicators of climate change and human health, such as heat mortality, air pollution exposure and how countries are adapting.
The report highlights the many health inequalities in how energy is used around the world. According to the report, the number of deaths caused by fossil fuel-derived air pollution decreased by 7% over 2016-21 – mainly due to wealthy nations phasing out coal.
However, the vast majority of low-income countries still rely heavily on biomass and other “dirty” fuels in their homes. Dr Marina Romanello, lead author and executive director of the Lancel Countdown, added that women and children are usually in charge of sourcing and burning the fuel, making them particularly vulnerable.
The authors also call out governments and fossil fuel companies for “fuelling the fire” through continuing investment into oil and gas assets that are likely to push the world past key warming targets. The study notes that fossil fuel subsidies exceeded national health spending in 2022 for more than 20 countries around the world.
Romanello told journalists her “concern” that governments and companies “keep on promoting fossil fuel expansion, to the detriment of health and survival of people worldwide”.
Extreme heat
The impacts of extreme heat are “insidious”, Prof Ollie Jay, director of the Heat and Health Research Centre at the University of Sydney and author on the report, told a press briefing.
He explained that certain groups of people are more vulnerable to heat – including infants, the elderly, pregnant women and people with pre-existing medical conditions.
In 2023, infants and adults older than 65 faced a new record high of 14 days of heatwaves per person, the report finds. This value exceeds the previous record, set in 2022, by more than 20%.
The combination of a warming and ageing world is putting more people at risk, the report says. For example, in 2023, demographic changes alone would have driven a 65% increase in heat-related deaths among over-65s, compared to the 1990-99 average. The addition of global warming pushes this percentage up to 167% – the highest highest level recorded.
Across the whole population, the authors find that people were exposed to an average of 50 more “health-threatening heat days” in 2023 than they would have been in a world without climate change. (These are defined as days when the daily average temperature exceeds the 84.5th percentile of the 1986-2005 daily regional average.)
Beyond this global average figure, less-developed countries are much more likely to see such health-threatening days. For example, 31 such countries experienced at least 100 more days of health-threatening heat due to climate change.
The map below shows the average number of days with health-threatening temperatures attributable to climate change per year, over 2019-23, by country. Darker colours mean more health-threatening days.
Heat stress is particularly dangerous for outdoors workers, who are often directly exposed to the heat while undertaking manual labour. In 2023, around one-quarter of the world’s population worked outdoors.
The report finds that countries with the lowest human development index (HDI) – a measure of a country’s development – have the highest proportion of outdoors workers, largely due to their reliance on the agricultural sector.
The report measures the number of “potential work hours lost” due to heat exposure, by considering temperature, humidity and “typical metabolic rate of workers in specific economic sectors”.
It finds that heat exposure drove a record high of 512bn potential work hours lost in 2023 – around 1.5 times the 1990-99 average. Approximately two-thirds of this loss was in the agricultural sector, mainly in low and medium HDI countries. In total, the global potential loss of income due to extreme heat reached a record high of $835bn in 2023, the report says.
Wealthy countries were generally the least impacted by heat stress. Very high HDI countries only saw around 41 lost hours per worker due to heat, causing an economic loss of around 1% of their GDP. Meanwhile, low HDI countries lost more than 200 hours per worker, and saw almost an 8% loss in their GDP.
The graph below shows percentage GDP loss due to heat stress in low, medium, high and very high HDI countries, in agriculture (light green), construction (dark green), manufacturing (orange) and services (purple).
This year’s report also introduces a new indicator assessing how night-time heat affects sleep loss. The authors estimate that high night-time temperatures led to 5% more sleep hours lost in 2019-23 than in 1986-2005.
The authors say that air conditioning is an “effective technology for reducing heat exposure”. However, they say that it can also be an example of “maladaptation”, as it is “expensive and energy-intensive, overwhelms energy grids on hot days, and can contribute to greenhouse gas emissions”.
They note that emissions from air conditioning increased by 8% over 2016-21. However, access to the technology is not universal. In 2021, 48% of households in very high HDI countries had air conditioning compared to only 5% of those in low HDI countries.
Malnutrition and disease
The report also unpacks how climate change is exacerbating food insecurity and malnutrition.
It finds that the total proportion of global land area affected by extreme drought for at least one month per year increased from 15% in 1951-60 to 44% in 2013-24.
The authors warn that “the higher frequency of heatwave days and drought months in 2022, compared with 1981-2010, was associated with 151 million more people experiencing moderate or severe food insecurity across 124 countries”.
This year, the authors also introduced a new indicator tracking changes in rainfall events. The authors divide up the world into 80km grid squares and monitor the number of rainfall events that exceed the 99th percentile of 1961-90 rainfall.
Over the last decade, extreme rainfall events increased in more than 61% of grid squares, the report finds. The authors warn that high rainfall can drive an increase in flooding, which can lead to a range of negative health incomes including outbreaks of certain diseases.
For example, Vibrio bacteria in coastal waters can cause “severe” gastrointestinal infections and “life-threatening sepsis”. The study finds that the length of coastlines with suitable conditions for the bacteria reached a new record high of more than 88,000km in 2023 – 32% above the 1990-99 average.
In addition, the total population living within 100km of coastal waters with conditions suitable for Vibrio transmission has reached a record high of 1.42 billion.
The authors also find that the climatic conditions for mosquitoes to transmit dengue, malaria and West Nile virus have increased between 1951-60 and 2014-23 as the world has warmed.
Fossil fuels
On energy use, the study notes that, “given the high greenhouse gas and air pollution emission intensity of coal, its phase-out is crucial to protect people’s health”.
Over 2016-21, very high HDI countries have seen a reduction in the share of energy that comes from coal. (The UK became the first G7 country to phase out coal power in September 2024.)
However, the report highlights that all low HDI countries are still very dependent on coal. Over 2016-21, the share of electricity that comes from coal in low HDI countries increased from less than 1% to 10%.
According to the report, the number of deaths caused by fossil fuel-derived air pollution – specifically, tiny particulate matter known as PM2.5 – decreased by 156,000 over 2016-21 – a drop of 7%. This is mainly due to reduced pollution from coal burning in high and very high HDI countries.
Dr Marina Romanello, the lead author of the report and executive director of the Lancet Countdown, told the press briefing that this an important result as it shows the “enormous potential of coal phase-out to improve health”.
However, the report also warns that biomass burning caused 1.24 million deaths in 2021 – an increase of 135,000 from 2016 levels.
For example, the report finds that 2.3bn people still cook using biomass. In low HDI countries, around 92% of countries use solid biomass for their household energy needs. Conversely, in very high HDI countries, this number is around 10%.
Romanello explained that biomass is “very unreliable, very unstable and particularly polluting”. She added:
“When households rely on biomass, it is often women and children that are in charge of sourcing the fuel, so it also generates disproportionate impacts on these groups.”
The authors also call out fossil fuel companies for “fuelling the fire”. One of the report’s indicators assesses the compatibility of fossil fuel company strategies with the Paris Agreement. It says:
“As of March 2024, the strategies of the 114 largest oil and gas companies have put them on track to exceed their share of greenhouse gas emissions consistent with limiting global heating to 1.5C by 189% in 2040, up from the 173% excess projected in March, 2023.”
The report analyses 86 countries that are collectively responsible for 93% of global CO2 emissions. They find that, in 2022, these countries awarded a record $1.2tn in fossil fuel subsidies. This funding exceeded 10% of national health spending in 47 countries and 100% in 23 countries.
Romanello shared her “concern” with the press briefing that “governments and companies keep fuelling the fire, keep on promoting fossil fuel expansion, to the detriment of health and survival of people worldwide”.
Adaptation
Finally, the report assesses countries’ preparedness for the health impacts of climate change. This section presents a mixed picture.
The report finds that, as of February 2024, fewer than half of the most recent country climate pledges made under the Paris Agreement mentioned a “health keyword”.
However, the report also finds areas of progress. For example, at the end of 2022, only four countries had put forward health national adaptation plans (HNAPs) outlining how they will plan for and adapt to the impacts of climate change on health. Just one year later, this number had jumped up to 40 countries.
Furthermore, the authors find that scientific engagement into the links between climate change and health is increasing. The number of scientific papers investigating the link between climate change and health reached a record high in 2023, with the vast majority of papers focusing on impacts, rather than mitigation or adaptation.
The graph below shows the number of academic papers published each year over 1990-2023 on climate change and health, focused on mitigation (orange), adaptation (green) and impacts (purple).
The report finds that some countries are already implementing successful adaptation measures. For example, it explains that countries with health early warning systems saw a 73% decrease in the number of people killed per extreme weather event between 2000-09 and 2014-23. In countries without such early warning systems, the decrease was only 21%.
The authors note that “the reduction cannot be directly attributed to the implementation of health early warning systems”, but suggest that countries that implement these systems likely have higher “engagement with climate change adaptation efforts”.
The positive news in this report is “not enough to tip the balance” or to “secure a healthy future”, Romanello told the press briefing. However, she said it is “meaningful progress” which can be “built on”.
Dr Jeremy Farrar served as chief scientist of the World Health Organisation, and was previously the director of the Wellcome Trust – the main funding body behind this report. He told journalists at the press briefing that despite the “incredible evidence base” available, the health community “have been too slow to make the case that climate change is a health crisis”.
However, he praised the intersectoral collaboration between health and climate experts, and said he hopes we are “turning a corner” on making sure that climate change is seen as a “health issue”.
The post More than half a trillion hours of work lost in 2023 due to ‘heat exposure’ appeared first on Carbon Brief.
More than half a trillion hours of work lost in 2023 due to ‘heat exposure’
China’s rapidly-expanding clean energy generation and deepening electrification has made the country more resilient to energy shocks, bolstering its position ahead of the COP31 climate talks in Türkiye, where speeding up the world’s electrification is set to dominate.
The growth of China’s renewable energy capacity protected it from the economic fallout from the energy crisis triggered by the closure of the Strait of Hormuz, according to analysis by the Centre for Research on Energy and Clean Air (CREA) published on Thursday.
As oil and gas stopped flowing through the key fossil fuel trade route, leading prices to soar, China’s crude oil imports – the largest in the world – fell sharply, leading the country to start drawing down on its reserves and curbing its exports of petroleum products.
“Yet, the import reduction did not produce the economic and social disruption in China one might normally expect from a shock of this scale,” the report found.
As temporary adjustment cushioned the oil-import shock, clean power and the electrification of the transport sector buffered the economic costs.
The rise of renewable energy and nuclear power have reduced China’s fossil fuel imports bill by more than $9 billion since 2020, more than any other country, according to CREA.
“China remains exposed to imported fuels, particularly where oil is used as a chemical feedstock, but reducing fossil-fuel demand already contributes to energy security,” said Qi Qin, the report’s author.
The view from Beijing: vindicated
CREA’s analysis found the roll-out of electric vehicles (EVs) displaced 38 million tonnes of oil equivalent between March and August, equivalent to around 13% of China’s crude oil imports in the same period the previous year.
China’s ongoing reliance on coal-fired power plants also protected the country against oil and gas supply disruptions, although coal power generation remained broadly flat in the six months since the start of the Iran war, according to the report.
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Li Shuo, director of China Climate Hub at the Asia Society Policy Institute, told Climate home News that China’s all-of-the-above approach to energy development has provided the country with the strategic flexibility to face the oil shock.
“While China has often been criticised in previous years for moving too slowly away from coal, this year’s global energy market volatility has given Chinese policymakers a renewed sense of confidence. There is a growing sentiment in Beijing that recent events have vindicated China’s energy strategy as both prudent and pragmatic,” he said.
Can China support the electrification pledge?
Despite its vast cleantech build-out and rapid electrification boosting its energy resilience, China has stopped short of endorsing an initiative by COP31 host Türkiye to increase the global share of electricity to 35% in final energy use by 2035.
Li Gao, vice minister at the Ministry of Ecology and Environment, who will lead the Chinese delegation at COP31, told a press conference the electrification target was in line with Chinese policy. “We believe that increasing electrification levels will help promote a green and low-carbon energy transition and address climate change,” he said.
China’s position on the electrification initiative is one of the major questions hanging over the COP31 talks beginning in Antalya next week.
“What is clear is that China has the most to gain from accelerated electrification because of their manufacturing capabilities,” said Bruce Douglas, CEO of the Global Renewables Alliance.
In 2026 alone, China’s exports of solar panels, batteries, EV and other cleantech are on track to avoid emissions equivalent to Brazil’s annual emissions.
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Campaigners and experts say the goal’s effectiveness in reducing emissions may be limited unless countries agree to meet it using only clean energy
Türkiye’s proposal doesn’t include a commitment to produce the power from clean energy, nor does it explicitly link electrification to the transition away from fossil fuels – issues on which the EU has signalled it is ready to push back.
But Chinese analysts say Beijing is unlikely to support linking a global electrification goal to commitments on phasing out fossil fuels.
Former French climate envoy Laurence Tubiana, the outgoing CEO of the European Climate Foundation, told Climate Home News that the EU and developed countries such as Brazil – which is influential within the BRICS group of large emerging economies – have a responsibility to push China to show leadership in the talks.
Driving the world’s electrification
The electrification of the Chinese economy has outpaced that of any other major economy.
In the US and the EU, the share of electrification has stagnated just above 20%. In China, it has doubled since 2005, reaching close to 30% in 2025.
The International Energy Agency (IEA) expects China will remain the single largest driver of global electricity demand growth through to 2030, as it electrifies its manufacturing sector as well as growing demand for cooling and EV charging.
Over the next five years, the IEA forecasts that China will increase its electricity consumption by as much as the total electricity consumption of the EU today.
In August, the Chinese government set a target to boost the share of electricity in its final energy consumption to 35% by 2030 – five years ahead of Türkiye’s proposed goal.
From laggard to frontrunner
Clean-power growth and electrification could meet all of China’s rising power demand, according to CREA. By 2030, this would mean renewable and nuclear energy could reach 54% of power generation – exceeding China’s target to generate half its electricity from non-fossil sources by the end of the decade.
Clean electricity already met all of China’s demand growth in 2025. “The challenge lies in sustaining such growth over several years,” said Qin.
From Beijing’s perspective, the global targets such as the electrification pledge “no longer appear particularly ambitious or threatening”, said Li, of the Asia Society Policy Institute.
“China, long perceived as a climate laggard, is increasingly moving ahead of countries in the Global North. A global ceiling target is increasingly only a floor for China,” he emphasised.
The post Clean power shields China from oil shock more than any other country appeared first on Climate Home News.
Clean power shields China from oil shock more than any other country